JPH0637597U - Stationary blade angle changing device - Google Patents

Abstract

(57) [Abstract] [Purpose] In the stator vane angle changing device, the number of holes to be accurately made in the radial direction in the vehicle compartment is halved to reduce the machining cost. [Structure] A lever is provided in a double manner like a first lever 2 and a second lever 4, one end of the second lever 4 is rotatably fitted to a stationary blade shaft 1, and a pin 5 is provided at the other end. The pin 5 is engaged with the groove of the ring, and the pin 6 is provided at the intermediate position. On the other hand, the first lever 2 is fixed to the stationary blade shaft 1 by a pin 3 and is provided with a groove 2a for engaging with the pin 6 at the other end.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a stator vane angle changing device for an axial compressor.

[0002]

[Prior art]

 In axial flow compressors, the vane mounting angle is often changed arbitrarily during operation for the purpose of expanding performance or operating allowable range. The general method in that case is as follows. That is, the front multiple stages are made variable (the number of stages varies depending on the specific design. In the example shown in FIG. 4, the inlet guide valve (1 GV), the first stage vane (1C), the second stage vane (2C), the third stage Stepped vanes (4 steps forward of 3C). In addition, the angle of movement will be smaller from front to back. In addition, it is often inversely proportional to the number of steps from the front, and in concrete terms, if one step is moved 10 ° from the front, the second step is 7.5 ° and the third step is 5 °. , The fourth stage is 2.5 ° (fixed after the fifth stage). In the figure, 1 is a stationary blade shaft, 8 is a vehicle interior, and 14 is an operation ring. In order to realize this relationship with one ring, the length of the lever of the stationary blade must be made longer toward the rear. In the above example, the fourth stage is the first stage. Approximately 4 times as long as the lever of (It will not be exactly 4 because the effect will occur if the mounting angle is tilted). Such an example is shown in FIG. Also, if the number of steps to be moved increases, for example, if the number of steps is 5, the lever length at the 5th step must be 5 times as long as at the 1st step, but this is serious in actual design as can be inferred from Fig. 5. It was a difficult problem. In order to solve this difficulty, the idea of using a double lever as shown in FIGS. 6 and 7 has been proposed in the past.

[0003]

[Problems to be solved by the device]

 However, the conventional examples of FIGS. 6 and 7 have the following problems. That is, at the stage where the double lever was provided, a hole for mounting the second lever had to be provided separately from the hole for mounting the wing in the passenger compartment. Moreover, this hole had to be machined with exactly the same accuracy as the hole to install the blade, in other words, it was close to double the hole of the correct size. In addition, it was very disadvantageous in terms of cost to machine a large number of holes on the outer circumference of a large ring with an accurate pitch in the radial direction. The present invention is intended to solve the above conventional problems.

[0004]

[Means for Solving the Problems]

 Therefore, the present invention is a device for arbitrarily changing the vane angles of a fluid machine during operation.A shaft is provided at one end of the vane, a lever is provided at the coaxial end, and a pin is provided at the other end of the lever. By providing a circular ring with a circular groove on the outside of the passenger compartment and engaging the pin of the lever with the circular groove to move the circular ring in the axial direction, or at the other end of the lever. By providing a hole and engaging a pin implanted in an annular ring provided on the outer periphery of the vehicle compartment with the hole or groove to move the annular ring in the circumferential or axial direction, the stationary vanes that move the stationary vanes all at once In the angle changing device, two levers are provided, one lever is rotatably fitted to the stator shaft at one end, and the other end is engaged with the groove or pin of the ring, and the pin, groove or A hole is provided, the other lever is fixed to the vane shaft, and the other end is a pin at the intermediate position of the lever. Holes engaging the groove or hole, those formed by providing a groove or a pin, it is an unit for which a problem solution.

[0005]

[Action]

 The stationary blade axis is moved by reducing the movement of the second lever by X / Y times by the first lever. That is, when the stationary blade shaft is directly moved by the second lever, an angle of ≉1 / Z rad is moved with respect to the unit movement amount of the annular ring in the axial direction. On the other hand, by combining the first lever, an angle change of ≈X / ZY rad results. It should be noted that the length of X cannot be reduced indiscriminately due to the trade-off of the diameter of the stationary blade axis, so although the reduction rate is naturally limited in the actual design, it can be moved with respect to a single lever. The angle can be made small enough. Also, the pin hole can be omitted as compared with the conventional method. That is, with respect to the stage to which the present invention is applied, the hole costly for processing can be reduced by half.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments of the drawings. FIGS. 1 to 3 show the embodiments of the present invention. 1 to 2 showing the first embodiment of the present invention, 1 is a stationary blade shaft, 2 is a first lever, 3 is a pin, 4 is a second lever, 5 is a pin, and 6 is also a pin. , 7 indicates the direction in which the second lever 4 is operated. 1 and 2, the first lever 2 and the second lever 4 are vertically combined at the shaft end of the vane shaft 1 supported by the casing 8 at one end of the vane, and the lever 4 is combined. Is provided with a pin 5 at the other end thereof, and on the other hand, an annular ring having a circumferential groove is provided outside the vehicle compartment 8, and the pin 5 of the lever 4 is engaged with the circumferential groove to move the annular ring in the axial direction. As a result, the stationary vanes are moved all at once. That is, the lever is provided in double like the first lever 2 and the second lever 4, one end of the second lever 4 is rotatably fitted to the stationary blade shaft 1, and the pin 5 is provided at the other end. The pin 5 is engaged with the groove of the ring, and the pin 6 is provided at the intermediate position. On the other hand, the first lever 2 is fixed to the stationary blade shaft 1 by a pin 3 and is provided with a groove 2a at the other end for engaging with the pin 6. A groove or a hole may be provided in place of the pin 6 provided on the second lever 4, and a pin may be provided instead of the groove 2a of the first lever 2.

Although FIGS. 1 and 2 show the state in which the pin 6 for moving the first lever 2 is implanted in the second lever 4, the reverse combination is also possible. That is, it is possible to combine the first lever 2 and the second lever 4 upside down. 1 and 2 show a case where the ring is moved in the axial direction, FIG. 3 shows a structure corresponding to FIG. 2 when the ring is moved in the circumferential direction. In FIG. 3, 10 is a first lever, 11 is a second lever, 12 is a pin for moving the first lever 10 with the second lever 11, and 13 is a direction for operating the second lever 11.

[0008]

[Effect of device]

 As described in detail above, according to the present invention, the number of holes that must be accurately drilled in the radial direction can be reduced by half. Although it is costly to form a large number of holes having an accurate diameter and an accurate pitch in the radial direction in a large passenger compartment as in the conventional case, the present invention is advantageous in cost because the holes are halved. Further, even if the shape of the lever is slightly different from the conventional one, there is no particular disadvantage in the case of the present invention in terms of the number of holes to be machined and the number of pins.

[Brief description of drawings]

FIG. 1 is a sectional view of a stator vane angle changing device according to a first embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a plan view of a stator vane angle changing device according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view of a vane portion of a conventional compressor.

5 is a sectional view taken along line AA of FIG.

FIG. 6 is a cross-sectional view showing a stationary blade portion of a compressor different from the conventional compressor shown in FIG.

FIG. 7 is a view on arrow B of FIG.

[Explanation of symbols]

 1 stationary blade shaft 2 first lever 2a groove 3 pin 4 second lever 5 pin 6 pin 7 direction to operate second lever

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Wataru Fujioka 2-8-25, Niihama, Arai-cho, Takasago-shi, Hyogo Takahishi Engineering Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A device for arbitrarily changing the vane angles of a fluid machine during operation, wherein a shaft is provided at one end of the vane,
A lever is provided at the coaxial end, and a pin is provided at the other end of the lever,
A ring with a groove is provided outside the passenger compartment, and the pin of the lever is engaged with the groove to move the ring in the axial direction, or a groove or hole is formed at the other end of the lever. Change the stationary blade angle by moving the stationary blade angle all at once by engaging the pin embedded in the annular ring provided on the outer periphery of the vehicle compartment with the same hole or groove to move the annular ring in the circumferential or axial direction. In the device, two levers are provided, one lever is rotatably fitted to the stationary blade shaft at one end, and the other end is engaged with the groove or pin of the ring, and the pin, groove or hole is provided at the intermediate position. , The other lever is fixed to the vane shaft, and the other end is provided with a hole, a groove or a pin that engages with the pin, groove or hole at the intermediate position of the lever described above. apparatus.